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An interstellar visitor may have changed the course of 4 solar system planets, study suggests

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by ...
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How Many Planets Are There in the Solar System?

There are 8 planets in our solar system. The planets orbit the Sun in elliptical trajectories, and they are all different in size, composition, temperature, and characteristics. The planets can be ...